foote



1. H. roon.

BOILER FURNACE.

APPLICATION FILED SEPT. I2. 1918.

11,393,03. Patented Nov. 25, 1919.

2 SHEETS-SHEET l.

mg y

.Zrzverz in r QM 2; @MZA' fitter/leg J. H. F0 B ru APPLICAT Patented N 0V. 25, 1919.

2 SHEETS-SHEET 2- OTE. RNACE.

LED SEPTJZ, 191a //f\ K WW I WAV- 1 specification.

JOHN-H. rooms, or JaMMQa-nnw YoaK.

roman-FURNACE.

Reference may be had tothe accompanying drawings, and the reference characters marked thereon, which form a part of this Similar characters refer to similar parts in the several figures therein.

This invention relates'to arches for: boiler furnaces and is particularly adapted for the rear archlof a" furnace for an ordinary fineboiler.

In boiler-furnaces of the type to which this invention more particularlyre lates it is customary to form a rear arch extending from side wall to side wall'of the furnace the broken line 5-5 in Fig. 1, illustrating walls, and from the rear furnace wall to the rear end of the boiler, whereby the heated gases from the combustion chamber are deflected and directed back through the fines of the boiler. Such a rear arch has been commonly made of a. series of elongated firebrick blocks arranged side by side which blocks are subjected on their inner or lower sides to theintense heat of. said gases. Much difficulty has been experienced in properly supporting such anarch, particularly along" the inner end of the arch adjacent to. theend of the boiler. Various means have been devised and employed for providing the neces? sary support for the inner end of. such. an arch, all requiring the use of devices separate from, and added to, theconstructionproper of the furnace and arch, one form of such supporting means or mechanism. being shown in Letters Patent heretofore granted to me, No. 7 53,059, dated February 23, 71904:,

for boiler'furnace. While the device shown in my said patent successfully accomplishes the desired result, it will be apparent that the use of the added supporting-bar" for the front. portion'of thev arch requires the formation of grooves in. the inner ends of the fire-brick blocks whereby said. inner'ends are; weakened and renderedmore liable to" fracture; and it Is difiicultun'such a con struction to repair or replace a broken block without taking down practically the. entire. arch.

T iqrin pa je t fithe invention are to provide a more durable arch, an" arch which can be quite readily repaired, and to eliminate the use of additional supporting devices for sustaining the end of the arch which-is adjacent to the end of the boiler;

Other objects will appear in connection with the following description.

Figure 1 of the drawings is a central"- longitudinalsection of: my improved furnace Specification of Letters Patent. Patented Nov. 25, 19-19.. Application filed September 12, 1918': Serial No. 253,708. 7 V

with the front portion, which may be offany known construction, broken away, the boiler being shown in side'elevation.

Fig; 2 is a vertical cross-section. taken on the broken line 2-2 in Fig. 1.

Fig. 3 is a view in isometrical perspective of the arch detached, the arch being formed of a plurality of elongated bricks or blocks.

Fig. 4 is a similar view of one of the bricks or blocks detached. I

Fig. 5 is a view in cross-section taken. on

themanner in which the key-block is raised or removed in the operation of replacing a receive and support the outer end portions of the elongated fire-brick arch-blocks, 5', 5 and 5 which make up the rear arch of the furnace. 1

- I have shown theblocks, 5, which form the leftha-nd part'of the arch as viewed from the front or in Fig. 3, rabbeted to overlap i one another. from the middle ofthe arch to.

the left-hand side wall of the furnace, the outermost of said blocks being rabbeted to. receive and overhang said sidewall.

The blocks, 5 ,.which form the right-hand part ofthe arch. are in like manner rabbeted formed with a prominent seat, 4, adapted to i to overhang'one another from the middle of the arch to the right-hand side wall of the furnac'ep the outermost of said blocks being rabbeted to receive and overhang; saidside wall.

ner edgesto receive the head of a T shaped' key bloc'k, 5", which overhangs both of said innermost blocks, 5 and. 5;, as shown.

The blocks y? be furtheriute 'l eked y Theinn ermost block, 5, and the innermost block, '5', are rabbeted along their upper in- 1 wall, 3, and the neighboring end, 8, "of the' forming upon the sides of certain of the blocks small bosses or studs, 7 adapted to engage correspondingly located oppositely disposed recesses, 15, in' the nelg'hbormg wall of the next adjacent block. The outer end portions, 5, of the'archblocks are made much more heavy than has been .7 customary and are extended outwardly much farther than has been Gustomary, whereby the portionofthe block which issupported .by and overhangs the seat, 4, is of approximately the same'weight asthe portion ofthe block between the rear boiler, 9. V

The inner ends of the several blocks-,5,

rest against the neighboring end of the boiler above the line of the flue-openings,

and at a substantial height above the, plane of the seat, 4:, on the end wall of the furnace,

whereby'tendenc'y to a downward swinging movement of-the inner end of the arch is re 'sisted by engagement of the inner end of the arch with theneighboring end of the boiler due to the fact that such a downward swinging movement would cause. the ,inner end of the arch to traverse a curved path] intersecting the end of the boiler.

As the blocks are approximately balanced upon the seat, 4, due vto thedistribution of weight'above referred to, but little force is required to prevent such downward swinging movement of the inner end of the arch. As a further means for preventing. any such downward swinging or deflection of the inner end of the arch, I provide, the seatoverhanging portions of the blocks', 5 with vertical bolt-receiving,openings, 10, which a may beformed in the blocks in any known manner, but which are shown'as preferably formed by complementary grooves in the neighboring; sides of two. adjacent blocks; and I mount in theendwall, 3, of the 111? nace, anchonbolts, 11, adapted to project upwardly through said openings, ,10,"an d have ing on their :upper ends nuts, 12,- adapted to be screwed down into engagement with the upper sideof the seat-overhanging portions. of the respective blocks. The blocks are thus held securely in position under all conditions of use.

" Should. the key-block, 5 become broken i or defective it can readily be removed by V loosening such of the. nuts, 12, as lock itin 7 position, whereupon. it can be raised, or it can be;chipped or broken until itcan be removed,.v.whereupon anew key-block may/be inserted in the arch in place of the defective I one, o 1'] Ifone of the other blocks in" the arch be.-

access to, and the removal of, .a defective: block on one sid'eofjthe middle of the'arch" and replacement thereof by- -a new block,

without disturbingtheblocks on the other side of the middle ofthe arch.

In thus substituting a new block without dismountingthe whole arch, the bosses or studs, 7, may be removed where they interfere with the insertionof the new block.

The inner ends of the arch blocks, 5, are

preferably chamfered onthe upper side as atv 13, forming agroove between'th'e end of the boiler and the inner ends of the blocks whichgroove is filled with cement, 14;, forming a tight jointbetween theinner' end of bers of the interlocked blocks overhang and j restupon the side walls of the;furnace, the

inner end of the arch is rendered self-supporting except forits engagement 'Wltll the side wallsof. the furnace and the end of the boiler, and but slight, assistance needed from the anchor-bolts, 11, to vsecurely hold the outer portions of thearch in position. I

' For the cement, 14:, I preferably employf asbestos fiber'cement, as it accommodates itself to the contraction and expansion of the joint between the inner end of the arch and the endvof the boiler.

To more uniformly distribute the holding force of the nuts, 12, and to prevent injury to the blocks, Ipreferto interpose between thenuts and theires pective blocks, plates or washers, 16. 5 r What I claim as new by Letters Patent is:

1.v The combination with the walls of a boiler-furnace and ,a boiler mounted within and desire to secure i V V 100,

said .walls, a wall of thefurnace oppositei;

the'end of the boiler having an archblocl supporting seat;..of an arch-block.extendsaid blockf being approximately equal in ios. 1 ing betweensaid furnace-wall and theneig h V boring! end of the boiler, with a portion of said block supported, by and, overhanging said seat, said seat-overhangingportion of 1101 I weight to the portion. of said block-between r saidifurnace wall; and the neighboringend; of the boiler; and; any archsblockebolting member mounted 'inisaid furnace-wall' in connection wlth sald c ,seatbverhanging por-. tion of'saidiblo k q 2. The combination with detail (if a" boiler-furnace and aboiler mquntea within the-end of the boiler havingran arch-block- :said'wa'lls, afwall of the furhaizeopposite.

supporting seat;of an arch-block extending between said'furnace-walLandtheneighbor- T ing end of, the boiler with the: inner end of said-block adjacentlto said endo fthe'v boiler at a point substantially higher than the block having "a' portion thereof supported by 7 horizontal plane of said seatysaid inner endf r of the block being'chamferedlon its upper side to form between the block and said end r of the boiler acement-receiving groove, said and overhanging said seat approximately equal in weight to the portion of said block between said wall and said end of the boiler; a body of cement occupying said groove between the inner end of the block and the neighboring end of the boiler, and a connection between the seat portion of the furnace-wall and the seat-overhanging portion of said block.

3. The combination with a boiler; of a furnace within which said boiler is mount ed, having side walls, and an end Wall op posite an end of the boiler, said end wall having an arch-block-supporting seat; of an arch formed of interlocked arch-blocks extending from side wall to side wall of the furnace, and from said end wall of the furnace to the neighboring end of the boiler with the end blocks of said arch overhanging and supported by said side walls of the fur nace, and the inner ends of said blocks in engagement with said end of the boiler; said blocks having portions supported by and overhanging said seatapproximately equal in weight to the portions of said blocks between said wall and the end of the boiler, the inner end of said arch being self-supported save for its engagement with the side walls of the furnace and said end of the boiler.

4. The combination with the walls of a boiler-furnace; and a boiler mounted within said walls, the wall opposite the end of the boiler having an arch-block-supporting seat; of a plurality of arch-blocks each 6X- tending between said furnace-wall and the neighboring end of the boiler, and having a portion supported by and overhanging said seat, certain of said blocks being provided with a vertical bolt-receiving opening formed between neighboring blocks; an anchor -bolt mounted in said end wall of the furnace projectingupwardly through said bolt-receiving opening between neighboring blocks; and a nut on the upper end of said anchor-bolt in engagement with said seatoverhanging portions of said neighboring blocks.

5. The combination with a boiler; of a furnace within which said boiler is mounted, having side walls, and an end wall opposite an end of the boiler, said end wall having an arch-block-supporting seat; an arch formed of interlocked arch-blocks extending from side wall to side wall of the furnace, and from said end wall of the furnace to the neighboring end of the boiler with the end blocks of said arch overhanging and supported by said side walls of the furnace, and the inner ends of said blocks in engagement with said end of the boiler, said blocks having port-ions supported by and overhanging said seat approximately equal in weight to the portions of said blocks between said wall and the end of the boiler, said seat-overhanging portions of the blocks being formed with vertical bolt-receiving openings; anchor-bolts mounted in said end wall of the furnace projecting upwardly through saidbolt-receiving openings in the blocks; and nuts and washers on the anchorbolts in engagement with said seat-overhanging portions of the blocks.

6. The combination with a boiler; of a furnace within which said boiler is mounted having side walls, and an end wall opposite an end of the boiler, said end wall having an arch-block-supporting seat; of an arch-comprising a series of arch-blocks eX- tending from side wall to side wall of the furnace, and from said end wall of the furnace to the neighborlng end of the boiler,

one of said blocks being T-shaped and overhanging the neighboring blocks on either side, the other blocks overhanging one another from said key-block to the respective side walls of the furnace, the outermost of said blocks overhanging the respective side walls of the furnace.

In testimony whereof I have hereunto set my hand this 5th day of Sept, 1918.

, JOHN H. FOOTE. 

